UBUNTU-CVE-2026-98631: Medium severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: xsk: Use a 32-bit compare in xskmapgenlookup xskmapgenlookup() loads a u32 key and compares it with maxentries using BPFJMPIMM. BPF immediates are sign-extended to 64 bits, so a maxentries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xskmap[]. Compare with BPFJMP32IMM so the check stays in 32-bit unsigned range.